package com.google.gwt.sample.stockwatcher.client;

import java.util.ArrayList;
import java.util.Date;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;



/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
	  public class SotckWatcher implements EntryPoint {
	  private static final int REFRESH_INTERVAL = 5000; //ms
	  private VerticalPanel mainPanel = new VerticalPanel();
	  private FlexTable stocksFlexTable = new FlexTable();
	  private HorizontalPanel addPanel = new HorizontalPanel();
	  private TextBox newSymbolTextBox = new TextBox();
	  private Button addStockButton = new Button("Add");
	  private Label lastUpdatedLabel = new Label();
	  private Label errorMsgLabel = new Label();
	  
	  private ArrayList<String> stocks = new ArrayList<String>();
	   
	  private StockPriceServiceAsync stockPriceSvc = GWT.create(StockPriceService.class);
	  
	/**
	 * This is the entry point method.
	 */
	public void onModuleLoad() {
		
		// Create table for stock data.
	    stocksFlexTable.setText(0, 0, "Symbol");
	    stocksFlexTable.setText(0, 1, "Price");
	    stocksFlexTable.setText(0, 2, "Change");
	    stocksFlexTable.setText(0, 3, "Remove");
		
       // Add styles to elements in the stock list table.
	    stocksFlexTable.setCellPadding(6);
	    stocksFlexTable.getRowFormatter().addStyleName(0, "watchListHeader");
	    stocksFlexTable.addStyleName("watchList");
	    stocksFlexTable.getCellFormatter().addStyleName(0, 1, "watchListNumericColumn");
	    stocksFlexTable.getCellFormatter().addStyleName(0, 2, "watchListNumericColumn");
	    stocksFlexTable.getCellFormatter().addStyleName(0, 3, "watchListRemoveColumn");
	    
	    // Assemble Add Stock panel.
	    addPanel.add(newSymbolTextBox);
	    addPanel.add(addStockButton);
	    addPanel.addStyleName("addPanel");

	    
	    // Assemble Main panel.
	    errorMsgLabel.setStyleName("errorMessage");
	    errorMsgLabel.setVisible(false);
	    
	    mainPanel.add(errorMsgLabel);
	    mainPanel.add(stocksFlexTable);
	    mainPanel.add(addPanel);
	    mainPanel.add(lastUpdatedLabel);
	    
	    // Associate the Main panel with the HTML host page.
	    RootPanel.get("stockList").add(mainPanel);
	    
	    // Move cursor focus to the input box.
	    newSymbolTextBox.setFocus(true);
	    
	    // Listen for mouse events on the Add button.
	    addStockButton.addClickHandler(new ClickHandler() {
	      public void onClick(ClickEvent event) {
	        addStock();
	      }
	    });

	    // Listen for keyboard events in the input box.
	    newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
	      public void onKeyPress(KeyPressEvent event) {
	        if (event.getCharCode() == KeyCodes.KEY_ENTER) {
	          addStock();
	        }
	      }
	    });
	    
	 // Setup timer to refresh list automatically.
	    Timer refreshTimer = new Timer() {
	      @Override
	      public void run() {
	        refreshWatchList();
	      }	
	    };
	    refreshTimer.scheduleRepeating(REFRESH_INTERVAL);
	    
	}

	protected void refreshWatchList() {
		
		// Initialize the service proxy.
	    if (stockPriceSvc == null) {
	    	System.out.println("stock price is not created");
	      stockPriceSvc = GWT.create(StockPriceService.class);
	    }

	    // Set up the callback object.
	    AsyncCallback<StockPrice[]> callback = new AsyncCallback<StockPrice[]>() {
	      
	    	public void onFailure(Throwable caught) {
	    	  
	    	   // If the stock code is in the list of delisted codes, display an error message.
	          String details = caught.getMessage();
	           
	          if (caught instanceof DelistedException) {
	            details = "Company '" + ((DelistedException)caught).getSymbol() + "' was delisted";
	           }

	          errorMsgLabel.setText("Error: " + details);
	          errorMsgLabel.setVisible(true);
	      }

	      public void onSuccess(StockPrice[] result) {
	    	  System.out.println("success connect");
	    	  updateTable(result);
	      }
	    };

	    
	    // Make the call to the stock price service.
	    stockPriceSvc.getPrices(stocks.toArray(new String[0]), callback);
	    
	    String[] temp = stocks.toArray(new String[0]);
	    
	    for(String str : temp){
	    	System.out.println(str);
	    }
	    
	}
	
	@SuppressWarnings("deprecation")
	private void updateTable(StockPrice[] prices) {
		
		for (int i = 0; i < prices.length; i++) {
		      updateTable(prices[i]);
		    }
		
		// Display timestamp showing last refresh.
	    lastUpdatedLabel.setText("Last update : "
	        + DateTimeFormat.getMediumDateTimeFormat().format(new Date()));
	    
	 // Clear any errors.
	    errorMsgLabel.setVisible(false);
	}

	private void updateTable(StockPrice price) {
		
		if (!stocks.contains(price.getSymbol())) {
		      return;
		}

		int row = stocks.indexOf(price.getSymbol()) + 1;

	   // Format the data in the Price and Change fields.
	   String priceText = NumberFormat.getFormat("#,##0.00").format(price.getPrice());
	   NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
	   String changeText = changeFormat.format(price.getChange());
	   String changePercentText = changeFormat.format(price.getChangePercent());

		// Populate the Price and Change fields with new data.
		stocksFlexTable.setText(row, 1, priceText);
		Label changeWidget = (Label)stocksFlexTable.getWidget(row, 2);
	   changeWidget.setText(changeText + " (" + changePercentText + "%)");
	   
	    // Change the color of text in the Change field based on its value.
	    String changeStyleName = "noChange";
	    if (price.getChangePercent() < -0.1f) {
	      changeStyleName = "negativeChange";
	    }
	    else if (price.getChangePercent() > 0.1f) {
	      changeStyleName = "positiveChange";
	    }

	    changeWidget.setStyleName(changeStyleName);
    }

	protected void addStock() {

		final String symbol = newSymbolTextBox.getText().toUpperCase().trim();
	    newSymbolTextBox.setFocus(true);

	    // Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
	    if (!symbol.matches("^[0-9A-Z\\.]{1,10}$")) {
	      Window.alert("'" + symbol + "' is not a valid symbol.");
	      newSymbolTextBox.selectAll();
	      return;
	    }

	    newSymbolTextBox.setText("");

	    // Don't add the stock if it's already in the table.
	    if (stocks.contains(symbol))
	      return;

	    // Add the stock to the table.
	    int row = stocksFlexTable.getRowCount();
	    stocks.add(symbol);
	    stocksFlexTable.setText(row, 0, symbol);
	    stocksFlexTable.setWidget(row, 2, new Label());

	    
	    stocksFlexTable.getCellFormatter().addStyleName(row, 1, "watchListNumericColumn");
	    stocksFlexTable.getCellFormatter().addStyleName(row, 2, "watchListNumericColumn");
	    stocksFlexTable.getCellFormatter().addStyleName(row, 3, "watchListRemoveColumn");
	    
	   // Add a button to remove this stock from the table.
	    Button removeStockButton = new Button("x");
	    removeStockButton.addStyleDependentName("remove");
	    
	    removeStockButton.addClickHandler(new ClickHandler() {
	      public void onClick(ClickEvent event) {
	        int removedIndex = stocks.indexOf(symbol);
	        stocks.remove(removedIndex);
	        stocksFlexTable.removeRow(removedIndex + 1);
	      }
	    });
	    stocksFlexTable.setWidget(row, 3, removeStockButton);

	   // Get the stock price.
	   refreshWatchList();
	}	
}
